LXR linux/drivers/video/logo/logo.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2
   3/*
   4 *  Linux logo to be displayed on boot
   5 *
   6 *  Copyright (C) 1996 Larry Ewing (lewing@isc.tamu.edu)
   7 *  Copyright (C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8 *  Copyright (C) 2001 Greg Banks <gnb@alphalink.com.au>
   9 *  Copyright (C) 2001 Jan-Benedict Glaw <jbglaw@lug-owl.de>
  10 *  Copyright (C) 2003 Geert Uytterhoeven <geert@linux-m68k.org>
  11 */
  12
  13#include <linux/linux_logo.h>
  14#include <linux/stddef.h>
  15#include <linux/module.h>
  16
  17#ifdef CONFIG_M68K
  18#include <asm/setup.h>
  19#endif
  20
  21static bool nologo;
  22module_param(nologo, bool, 0);
  23MODULE_PARM_DESC(nologo, "Disables startup logo");
  24
  25/*
  26 * Logos are located in the initdata, and will be freed in kernel_init.
  27 * Use late_init to mark the logos as freed to prevent any further use.
  28 */
  29
  30static bool logos_freed;
  31
  32static int __init fb_logo_late_init(void)
  33{
  34        logos_freed = true;
  35        return 0;
  36}
  37
  38late_initcall_sync(fb_logo_late_init);
  39
  40/* logo's are marked __initdata. Use __ref to tell
  41 * modpost that it is intended that this function uses data
  42 * marked __initdata.
  43 */
  44const struct linux_logo * __ref fb_find_logo(int depth)
  45{
  46        const struct linux_logo *logo = NULL;
  47
  48        if (nologo || logos_freed)
  49                return NULL;
  50
  51        if (depth >= 1) {
  52#ifdef CONFIG_LOGO_LINUX_MONO
  53                /* Generic Linux logo */
  54                logo = &logo_linux_mono;
  55#endif
  56#ifdef CONFIG_LOGO_SUPERH_MONO
  57                /* SuperH Linux logo */
  58                logo = &logo_superh_mono;
  59#endif
  60        }
  61        
  62        if (depth >= 4) {
  63#ifdef CONFIG_LOGO_LINUX_VGA16
  64                /* Generic Linux logo */
  65                logo = &logo_linux_vga16;
  66#endif
  67#ifdef CONFIG_LOGO_SUPERH_VGA16
  68                /* SuperH Linux logo */
  69                logo = &logo_superh_vga16;
  70#endif
  71        }
  72        
  73        if (depth >= 8) {
  74#ifdef CONFIG_LOGO_LINUX_CLUT224
  75                /* Generic Linux logo */
  76                logo = &logo_linux_clut224;
  77#endif
  78#ifdef CONFIG_LOGO_DEC_CLUT224
  79                /* DEC Linux logo on MIPS/MIPS64 or ALPHA */
  80                logo = &logo_dec_clut224;
  81#endif
  82#ifdef CONFIG_LOGO_MAC_CLUT224
  83                /* Macintosh Linux logo on m68k */
  84                if (MACH_IS_MAC)
  85                        logo = &logo_mac_clut224;
  86#endif
  87#ifdef CONFIG_LOGO_PARISC_CLUT224
  88                /* PA-RISC Linux logo */
  89                logo = &logo_parisc_clut224;
  90#endif
  91#ifdef CONFIG_LOGO_SGI_CLUT224
  92                /* SGI Linux logo on MIPS/MIPS64 */
  93                logo = &logo_sgi_clut224;
  94#endif
  95#ifdef CONFIG_LOGO_SUN_CLUT224
  96                /* Sun Linux logo */
  97                logo = &logo_sun_clut224;
  98#endif
  99#ifdef CONFIG_LOGO_SUPERH_CLUT224
 100                /* SuperH Linux logo */
 101                logo = &logo_superh_clut224;
 102#endif
 103        }
 104        return logo;
 105}
 106EXPORT_SYMBOL_GPL(fb_find_logo);
 107